exam Maths Puzzle Numerical Ability

Barry can do a certain job in 2 hours, where as it takes Sanchez 3 hours to do the same job. How long would it take them to do the job working together?

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exam Other Question

1.) Perform the indicated operations:

a.) b^3 - b^2 + 3b - (b - 3) + (3 - 2b^2 + 3b^3)=

b.) -3(3 - b)(3 + b) =

c.) (c - 3)^2=

d.) (a - b)(a^2 + ab + b^2)=

e.) 6c^2 - 12c +3 / -3c = Thank you in advance for your assistance. I am searching for the forumla (s) to use to solve the following problem any help is appreciated.

College Funds, The first child will s